- From: Eddie Robertsson <eddie@allette.com.au>
- Date: Mon, 04 Feb 2002 10:20:09 +1100
- To: Autumn Cuellar <a.cuellar@auckland.ac.nz>
- CC: xmlschema-dev@w3.org
Hi, > <xsd:attribute ref="cellml:name" use="required" /> > <xsd:simpleType> > <xsd:restriction base="cellml:CellMLidentifier"> > <xsd:pattern value="^(ampere)^(becquerel)" /> > </xsd:restriction> > </xsd:simpleType> > </xsd:attribute> > > In explanation (should you need one), the cellml:name attribute is a > global att. with type="cellml:CellMLidentifier" (which restricts the > string datatype to just letters, digits, and underscores). In this > instance I want to further restrict the value so that it cannot be > certain words, e.g. the value of the name attribute cannot be "ampere" > nor "becquerel". Two questions: > 1)Is this a valid way to further restrict the type of the global > attribute? Not really. When you choose to use the ref attribute you can never redefine the type of the element or attribute. The ref attribute means that it is a reference to the original attribute/element and you can't change that. To redefine a type of an attribute you have to use the xs:redefine function [1]. > 2)Is using the <pattern> element the way I've used it valid, and does it > convey what I intended? (ok, maybe that was 3 questions...) No. AFAIK there's no way of specifyijng exclusions like this in W3C XML Schema. Cheers, /Eddie [1] http://www.w3.org/TR/xmlschema-0/#Redefine > > > Thanks! > > -- > Autumn A. Cuellar > Bioengineering Institute > The University of Auckland > New Zealand
Received on Sunday, 3 February 2002 18:11:04 UTC